Novel Design of Depth-$L$ Nyquist ($N$) Filters for Linear and Time Variant Channel Fractionally Spaced Equalizer

This paper addresses the design of FIR depth-L Nyquist (N) filter and its corresponding biorthogonal partners. The proposed approach is based on the equalization of the comb filters. The resulting biorthogonal filters have larger attenuation at the stopband than the original comb filters. As an application of the proposed filter, we consider the design of fractional spaced equalizers considering linear and time variant channels.